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During this time Ferdinand Hillier snipped a lock of Beethovens hair as a keepsake which was treasured as a Hillier relic in Vienna for more than a century. The lock was then given to Danish doctor Kay Alexander Fremming who kept it throughout the war. When Fremming died, his daughter sent the lock of hair to Sotherby's for auction in 1994. It was then sent to America for Forensic Testing. It was discovered that Beethoven quite possibly died of lead poisoning due to the high lead content that the hair contained although this hasn't officially been proven.
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on display in the Beethoven-Haus together with a certificate of authentication from the Viennese art expert Anton Gräffer.